Product $A$ is

Which one of the following is not formed when acetone reacts with $2-$pentanone in the presence of dilute $NaOH$ followed by heating?

$A$ molecule $(X)$ with the following structure is hydrolyzed under mild acidic conditions to produce $(Y)$ and $(Z)$. Identify the correct statements about $(Y)$ and $(Z)$.

Which of the following is a hemiacetal?

The major products of the following reaction are:

Consider the following chemical reaction.
$CH \equiv CH \xrightarrow[{(2) CO, HCl, AlCl_3}]{{(1) Red hot Fe tube, 873 K}} \text{Product}$
The number of $sp^{2}$ hybridized carbon atom$(s)$ present in the product is ..........